Materials Literature
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Stable nitroxyl radicals are important tools in chemistry, biophysics, biology, and materials science. Their stability and the sensitivity of their EPR spectra to the local environment make them valuable molecular probes. This review seeks to give an overview of the developments in the field of nitroxide spin probes a…
Future 3-D applications require a very low pitch for inter-strata vertical interconnection. The last International Technology Roadmap for Semiconductors (ITRS) assessment for vertical interconnection predicts a need for decreasing the interconnection pitch to 10μm. The room-temperature insertion technology has been pr…
A 1.2 MV∕50 mA symmetrical Cockcroft-Walton (SCW) power supply of over 83% power efficiency, driven by 50 Hz frequency, was developed for an industrial electron beam irradiator. It is constructed by capacitors of 45 nF and 28.13 nF in the coupling column and capacitors of 18.75 nF in the smoothing column. Working stat…
Composites with different ratios of gelatin and silica are prepared. The water absorption of these materials from the gas and liquid phase and the water release from the composites under heating are studied. It is shown that the addition of silica decreases the water absorption of gelatin materials and makes it possib…
We propose a mathematical model of nonradiative electronic excitation energy transfer between donor and acceptor molecules near the surface of an infinitely long conducting nanocylinder by means of surface plasmons. We reveal that, under resonance conditions, the rate of transfer increases compared to the case of the…
The statistical methodology of population balance (PB) has been applied in order to predict the effects of cross-linking and chain-scissioning induced by ionizing radiation on the distribution of molecular weight between cross-links (MWBC) of a siloxane-based elastomer. Effective molecular weight distributions were ex…
Fly ash (FA) from Chandrapura Thermal Power Station in Jharkhand, India were used to amend soil from fallow land in the proportion equivalent to 60, 120, 180, 240 tons.ha in selected vegetables and 10, 20, 30, 40, 50% in selected leguminous crops economically grown in the region, and performance of individual species…
This paper presents an analytical model to evaluate the inter-turn short-circuit current in a Fault Tolerant Permanent Magnet Synchronous Machine (FT-PMSM) for different winding configurations. By evaluating slot-leakage and air-gap fluxes, the inductance of both healthy and faulty parts of the phase winding, as well…
In order to obtain the maximum efficiency from a hybrid driveline it is crucial to optimize the power distribution between the electric drive and the internal combustion engine. An accurate estimation of how much electric power can be delivered at any instant of time is therefore of great interest. Such estimation is…
Electric motors is the backbone of many industrial process, however it consumes of large portion of energy. Increasing energy costs create incentives for movement toward higher efficiency systems. Large high speed induction motors which are operating on variable frequency drives with flexible rotordynamic designs are…
We have combined InfraRed thermography and thermal wave techniques to perform microscale, ultrafast (microsecond) temperature field measurements. The method is based on an IR camera coupled to a microscope and synchronized to the heat source by means of phase locked function generators. The principle is based on elect…
The dispersion relation of periodic structures that include metamaterials or materials with large anomalous dispersion can give bands with infinite group velocity points. These bands do not span the entire first Brillouin zone but are instead localized ink-space. We show that these points arise when both positive and…
Production of recombinant human-like collagen (RHLC) by thermoinduction of recombinant Escherichia coli BL 21 during high cell density cultivation was investigated in a 30 L bioreactor. The effects of induction temperature (T), pH, and carbon-to-nitrogen molar ratio of the nutrient medium (C/N) were examined. The opti…
This artice presents an exhaustive analysis of the mechanical behavior of a steel tube during its sinking drawing. The methodology consisted in three stages, respectively, devoted to tensile testing, tube drawing in laboratory at different strain rates and, finally, mechanical characterization via modelling and simula…
Fuel behaviors of the large fast breeder reactor have been investigated, as well as material attractiveness based on isotopic plutonium composition for evaluating proliferation resistance with regards to a combined evaluation of decay heat and spontaneous fission neutron barrier as key parameters of isotopic material…
Physicochemical properties of the novel photosensitizer meso-tetraphenyl chlorin disulphonate (TPCS2a) and the chemically related meso-tetraphenyl porphyrin disulphonate (TPPS2a) were investigated in aqueous solutions as part of pharmaceutical preformulation. Inflection points were calculated to be 3.9 for both compou…
Trioctahedral micas from kamafugitic lavas of Presidente Olegario (Brazil) are Ti-Fe-bearing fluorophlogopites. They were investigated using a combination of electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), and Mössbauer spectroscopy. EPMA data yielded the following ranges: Al 2 O 3 (8.7-…
Due to the naturally high torque ripple and non-linear characteristics, the applications of Switched Reluctance Motors (SRM) drives are very limited. It is well known that the Torque Distribution Functions (TDFs) method is one of the most effective methods to reduce their torque ripple. This paper presents an analysis…
The presented thermal impedance spectroscopy of power modules simplifies significantly the failure analysis of power modules. It enables online observation of degradation within the cooling path with detailed information about failure mechanisms. The degradation of certain layer within the power module is detected by…
This paper focuses on influence of design parameters of permanent magnet machines with concentrated windings on cogging torque, torque ripple and mean torque. An efficient approach is presented to estimate the magnet width and slot opening width for minimizing cogging torque and/or maximizing mean torque. Two-dimensio…